Four arrested during investigation of Philip Seymour Hoffman's death

Four individuals who are suspected of being connected to the drugs found in Philip Seymour Hoffman's apartment were arrested late Tuesday night.

Sources told CNN that a raid was conducted at an apartment in Manhattan. Three men and one woman were arrested.

In the apartment, 350 plastic bags that contained heroin were seized during the raid. The bags were labeled "black list" and "red bull," but they were not the same bags found in Hoffman's apartment.

The suspects' names are Juliana Luchkiw, 22; Max Rosenblum, 22; Robert Vineberg, 57; and Thomas Cushman 48. Vineberg had the actor's phone number stored in his cell phone.

Hoffman's body was found in his Manhattan apartment by a friend of his on Sunday. When police arrived, they saw Hoffman lying on the bathroom floor with a syringe in his left arm. Authorities found up to 50 envelopes that contained heroin in the apartment.

An autopsy was performed on his body and the results were released earlier today. The results were inconclusive, USA Today reported. A spokesperson from the New York City medical examiner's office says that more tests will be conducted to determine what killed Hoffman.

A funeral will be held on Friday in New York City for the Oscar winner.